System for transmitting electrical impulses



' June 11, 1929. i A, BARNAY 1,716,944

SYSTEM FOR TRANSMITTING ELECTRICAL IMPULSES Filed July 25, 1925 Fig.1 I

Fig.2

Patented June 11, 1929.

UNITED STATES ANTOINE BARNAY,

OI PARIS, FRANCE.

SYSTEM FOR TRANSMITTING ELECTRICAL IMPULSES.

Application filed July 25, 1925, Serial No.

This invention relates to a system for transmitting electrical impulses and refers more particularly to automatic telephone systems.

According to the present invention I provide an improved system having the following members (a) A recorder capable of receiving mpulses sent out by a calling station, recording them, and retransmitting them, whether transformed or not.

(b) Selectors of the type described in my prior United States Patent No. 1,556,474.

(0) An emission controller which prevents, after the retransmission of a series of impulses by the recorder, the retransmission of a new series of impulses, so long as a free selector which is to receive it has not been inserted in the connection circuits.

The improved system has the following advantages r 1. Owing to the fact that the duration of free choice of direction of the selectors is not limited, the duration of search may be increased so long as desired, and consequently the fields of contacts'to be explored may be as extensive as desired.

2. In the case when all the lines of a called group are occupied, any call coming along at that moment is postponed but not lost.

3. Owing to the possible increase of the period of search, the selectors may be simplified by suppressing the brush switching device.

4. The selectors do not require to have a position of rest.

Two constructional forms of the invention are illustrated by way of example on the accompanying drawings.

The constructional.example represented by Figure 1 provides the combination of the following members:

1. A recorder shown at E. By the term recorder there must be-understood any apparatus capable of receiving the impulses emitted by a calling station, recording them and retransmitting, whether transformed or not, to the different stages of selectors in order to connect up the calling Station to the called station. The system forming the sub ject of the present invention does not require any particular form of recorder which may be of any suitable type.

2. Selectors shown at S S which may be of the type described in the specification of my prior United States Patent No. 1,556,474.

46,076, and in France November 5, 1924.

3. A special device, peculiar to the invention, shown at C, and called hereinafter the emission controller.

When a calling station, connected to an auxiliary line comprising the wires 1 and 2 is Joine up to the recorder E, the series of mpulses emitted by the calling station are, 1n the known manner, received by such recorder E. The impulse transmitter 3 of the said recorder E is connected up to the auxiliary lines 45 running towards the selector S by means of the contacts 67 and 89, the relay 10 for connecting the auxiliary line to the recorder being at that moment excited.

We will assume the selector S to be guided towards the selector S by the first series of impulses emitted by the recorder E, this guiding having taken place as will be hereinafter described for directing the selector S on to the following selector by the second series of impulses.

So soon as the selector S is caught by the selector S the relay 11 is excited by the following circuit: earth 12 lower winding of relay 13131415596 loop through the transmitter 3 -7-84l6- l718 upper winding of relay 11 and to the free pole of the battery. The relay 19 is also excited at that moment by the circuit; earth to 20 (temporarily earthed by the selector S as will be shown later for 21 in the selector S -22-23-2425 upper winding of relay 1926-2728 and to the free pole of the battery. The exciting of the relay 11 produces the excitation of the relay 29 through 30. The relay 29 by way of 31 2632 earths the wire 23 to keep selector S engaged and likewise earths the lower winding of relay 19 through 3l2633 in order to keep this relay excited.

The transmitter 3 cuts out the circuit of the relay 11 anumber of times equal to the figure to be transmitted. On each de-excitation of the relay 11, the circuit of the electromagnet 34 of the control switch is closed by 35 slow relay 36-37 and to earth. The control switch is thus directed. During the transmission of impulses the slow relay 36 remains connected and through 38-39 maintains earth on the lower winding of the relay 11, which earth is out at 12 so soon as the control switch abandons its position of rest. 1

So soon as the control switch has left its position of rest the circuit of the driving I magnet of the selector is closed by 41-- 424t3 lt-45-46 and to earth. The selector turns so far as the first line of the group called, on which the driving circuit is cut at 44: owing to the excitation of the relay 47 in the circuit 4t8-4950-5152 and to earth. So soon as the relay d7 is excited and the slow relay 36 has dropped back, the free rotation of the selector begins.

It has been explained that the controller C prevents the .recorder E from emitting a new series of impulses before the final directing of the selector on a free line of the group called. For this purpose so soon as the series of impulses relating to the selector S is terminated, the recorder E by any known means temporarily earths the relay 53 which is excited through the contacts 54 and 55 to the free pole of the battery and is maintained connected through 55 and earth. The excitation of the relay 53 effects earthing through 56-8416--17--18 on the upper winding of relay 11in order to keep this relay 11 excited and consequently to keep the selector S engaged. On the other hand, the relay 57 is connected by 58951514--13 lower winding of 11-3938 to earth. The relay 57 is excited for a very short time until the slow relay 36 falls back, which produces no effect as explained below.

When relay 53 is excited it cuts off at 60 the circuit of the slow relay 59 which only falls back an instant after; the temporary exciting of the relay 57 therefore takes 1 place before the return to. rest of the contact 61, so that the relay 62 cannot be exgiteld so long as the relay 57 has not fallen When the relay 57 falls back after its temporary excitation the circuit of 62 is closed through 63--6164= and the earth; it is excited and maintained connected through 6564 and the earth. It opens at 55 the circuit of the relay 53 but this relay continues to be excited by 54; now during the entire period of excitation of this relay, the

circuit of the impulse transmitter 3 is open at 6 and 7, and the recorder locked by any suitable means. The de-excitation of the relay 53, and consequently the release of the locking of the recorder will only be effected when the selector shall have definitively been directed as will be described below.

When the slow relay 36 has fallen back and the relay 47 is excited, the circuit of the driving magnet 40 is once more closed by The relay 47 remains excited on all the lines of the group called, because the control wire 50 is multiplied on all the control contacts 68 corresponding to this group. The selecarises-e trolled by the excitation of the test relay 69 the circuit of which is closed by earth 70-'71-7 2 lower winding of 69-21737 and in the following selector a circuit similar to that of 19.

The excitation of the relay 69 gives rise at to the closing of the circuit of its upper maintaining winding, which will act when earth is again connected to the wire 21 by the following selector, as described for the wire 20. Earthing is maintained through 76 on the wire 23. The line wires 17 and 14 are connected by 7778, 79-80, to the line Wires 81, 82 of the following selector, and a line relay such as 11. At 26 the relay circuit 19 is cut off, and the control switch S is disconnected and consequently free; the relay 19 is retarded in order to afiord the relays such as 11 and 29 of the following selector sufficient time to become excited.

The connection of the two line wires 17 and 14: to the relay of the following selector similar to 11 has the effect of earthing by means of a contact such as 12, the relay 57 through the circuit: 5895151478- 82. The relay 57 is excited and at 54: cuts off the circuit of the relay 53 which falls back, releases the recorder and thus 1 permits the latter to send out the following series of impulses. The relay 53 is preferably retarded in order to give more certainty to the operation of the relays of the selector. If no line is free in the group called, the selector passes on to the first line of the following group; the relay 47 has its circuit open and falls back. The circuit of 40 is then closed again by 41424344- 45-46 and to earth, until the brushes, after a complete revolution, again reach the first line of the group called, and from that moment onwards, the circle described is reproduced indefinitely until a line becomes free again in the group, or the call is abandoned.

The release of the selectors takes place in a known manner.

In the constructional embodiment of the invention represented by Figure 2, use is made of the system of transmission of electric impulses forming the subject of my United States patent application Serial No. 34,992 filed June 4th 1925. In this example the recorder is designated by E the emission controller by O, the selectors by S,, S and the same reference figures are used to designate the similar parts to those of the first constructional example. It should be remarked that, in this example the selectors S' S have no position of rest and do not start until after directioning of the control switch.

The connection of the recorder E to the auxiliary line is eifected in the same way as in Figure 1, and as in the previous example the selector S is assumed to be directed to the selector S by the first series of impulses emitted by the recorder E.

So soon as the selector S is caught by the selector S, the relay 19 is excited through the circuit: earth 83202223-84 upper winding of 198586-87 and free pole of the battery. Relay 19 remains connected on its two windings in series with contact 88; through 89 it earths 1716-48 maintenance relay 90 of recorder E, free pole of battery. Through 91 earthin is efiected of the line relay 92, the circuit 0 which will be closed by 1314-15596 in the impulse transmitter 3 to the free pole of the battery for each impulse. Through 93, the relay 94 has its circuit closed in order to insulate from the free pole of the battery, at 87, the common wire 95, so as to make the other selectors associated with the control switch engaged.

On each impulse, the relay 92 is excited and closed through 96slow relay 36-97, the circuit of the magnet 34 of the control switch, the latter being thus directed. During the impulses, the slow relay 36 remains engaged.

At the completion of the impulses, the position of the emission controller C is modified. Temporary earthing is effected of the recorder E by any suitable means to the relay 53 which is held connected through 55 and earth and the other end of which is connected to the battery through a resistance 98. The circuit of relay 57 is closed by 58951514139291 and to earth, and at the same time the circuit of relay 99 is closed by 100 and 101. The relay 99 however being retarded in attraction, the relay 57 is excited first, and cuts out at 101 the circuit of 99 which, consequently, does not operate. The relay 57 has a sufiiciently high resistance so that the relay 92 is not excited in series with it.

When the slow relay 36 drops back at the end of the series of impulses, the circuit of magnet 40 is closed by41-42- 43-446745-46 and to earth. This circuit is cut at 44 when the brushes reach the first line of the called group owing to excitation of the relay 47 in the circuit: 47484968505152 and to earth. At the same time the circuit of the relay 102 is closed through 103674546 and to earth. This relay 102 is excited, is maintained connected by 104-4546 and earth, and cuts out at 91 the earth from the relay 92, and consequently at C", from the relay 57 which falls back. The relay 99 is then excited in the circuit; earth 10010199, and is maintained connected through 105 and 100.

From this moment onwards, a free directioning circuit is closed by; 40-41-42- 4310667-45 and 46. This circuit is open at 42, when the brushes of the selector meet a free line, through the circuit: earth 52 51 50 68 49 48-10772 lower winding of 69--7374 battery through the relay such as 19 of the following selector. The relay 69, owing to its excitation connects at 108 the earth from the wire 23 to the wire 21 and is maintained connected by the earth of the wire 23-109 and its upper winding. Through 77 and 78 the two line wires 14-17 are passed on to the line wire 81-82 of the following selector. Furthermore, through 84 the circuit of the relay 19 is cut off which releases the control switch.

On the other hand, the connection of the line wires on the following selector has the effect of establishing an excitation circuit of the relay 57 of C through 5895--15- l478-80-82 contact such as 13 in the fol lowing selector, relay such as 92, contact such as 91 and to earth. The relay such as 92 being in series with the great resistance of relay 57 is not attracted.

The excitation of the relay 57 produces the short-circui'ting of the relay 53 through earth, 100--110111. The relay 53 falls back, opens at 58 the circuit of 57, restores at 6 the circuit of the transmitter 3, and releases the recorder E.

At the end of the conversation, the relays fall back, but theselector remains in the position which it occupies.

In case of all the lines of the called group being occupied, the selector continues to rotate as explained in reference to Figure 1.

The two constructional examples described are of course susceptible of considerable variations such as for instance the following:

(a) The emission controller of type C might be used in the example of Figure 2 instead of type C, and vice versa.

(5) The combination of the contacts 39--1238 can be applied to the arrangement of Figure 2, in the place of the relay 102 and the contact 91, and vice versa.

(0) In particular selectors may be used with brush switching relays, such as those described in the specifications of my United States Patent No. 1,556,474 and application Serial N 0. 26,507 filed April 28, 1925.

((5) Use may also be made of selectors each comprising several driving agencies.

What I claim and desire to secure by Letters Patent is 1. An automatic telephone system having in combination register controllers for registering impulses sent by a calling station and resending them either as received or translated, sender controllers, single direction selector switchesocorresponding thereto arranged to be set by impulse receiving organs, each selector being arranged to continue the trunk hunting movement until an idle trunk in the wanted group is found, and means responsive to the sender controllers for inhibiting the resending of a series of impulses until the corresponding selector ceiving organs, each selector being arranged to continue the trunk hunting movement until an idle trunk in the wanted group is found, said selectors having no normal position.

3. An automatic telephone system according to claim 1 wherein the register control ler is prevented from resending a series of impulses by the opening of one of the lineconductors until the selector corresponding to the series of impulses is found and is ready to receive impulses.

4. An automatic telephone system according to claim 1 wherein the setting of the selectors does not commence until the corre sponding series of impulses has been sent.

5. An automatic telephone system according to claim 1 wherein selectors are provided in each of which the circuit of the operating element is closed only by two test relays one of which operates when the wipers are on the wanted group of lines and the other when the wipers are on the contacts of an idle line in the wanted group.

6. An automatic telephone system having in combination register controllers for registering impulses sent b a calling station and resending them eit er as received or translated, sender controllers .arranged to prevent the resending of a series of impulses until the corresponding selector is ready to receive them, and single direction selector switches arranged to be set by impulse receiving organs, each selector being arranged to continue the trunk hunting movement until an idle trunk in the wanted group is found, selectors being provided in which the circuit of one of the ,line conductors'comprises two interruptors one of which is closed when the impulse receiving organ is in the normal position while the other is held closed during the reception of the impulses by the selector. 1 v

7. An automatic telephone system accord ing to claim 6 in which the interrupter which is held closed during the reception of the im pulses is controlled by a slow to release relay inserted in the impulse circuit.

8. An automatic telephone system having in combination register controllers for registering impulses sent by a calling station, and resending them either as received or translated, sender controllers arranged to prevent the resending of a series of impulses until the corresponding selector is ready to receive them, and sin le direction selector switches arranged to b n set by impulse receiving organs, each selector being arranged to continue the trunk hunting movement until an idle trunk in the wanted grou is found, including selectors, in each of which the circuit of one of the line conductors comprises an inte'ruptor, normally closed, but arranged to be opened so soon as the selector has received a series of impulses.

9. An automatic telephone system having in combination register controllers for reg istering impulses sent by a calling station and resending them either as received or translated, sender controllers arranged to prevent the resending of a series of impulses until the corresponding selector is ready to receive them, single direction selector switches arranged to be set by impulse receiving organs, each selector being arranged to continue the trunk-hunting movement until an idle-trunk in the wanted group is found, said sending controllers being provided with a relay, the latter including an interruptor and means for actuating said interruptor when the selector which received the last series of impulses finds an idle line in the called group, the sending of impulses by the registering controller being inhibited by said relay, when actuated.

10. An automatic telephone system according to claim 9 having means for retard ing the effect produced on the stop relay by the operation of the interrupter arranged in its circuit.

11. An automatic telephone system according to claim 9 wherein the circuit of the stop relay comprises two interrupters one actuated by a relay included in the circuitof one of the line conductors and the other actuated by another relay which in turn is controlled by a slow to release relay.

12. An automatic telephone system according to claim 9 wherein the circuit of the stop relay comprises twointerrupters in series one arranged to be closed by a relay included in the circuit of one of the line 'conductors and the other controlled by a selector switches. arranged to be set by im-.

pulse receiving organs, eachiselector being arranged to continue the trunk-hunting movement until an idle trunk in the wanted group is found, the impulses being sent over only one line conductor, the other 7 line conductor being used as a holding conductor, the line-conductor which is opened to prevent the sending of impulses before the conductor'over which the impulses are controller for registering impulses and controlling the setting of the marking switches, and means to suspend the setting control by the register controller after the setting of a marking switch, until the end of the trunk hunting movement of the selecting switch associated with the said marking switch.

16. In an automatic telephone system, an impulse sending device, several stages of selectors, the said selectors comprising marking switches associated with continuous trunk hunting movement .selecting switches without normal position and capable of free trunk hunting movement. a

register controller for registering impulses and controlling the setting of the selectors, and means to suspend the setting control by the register controller during the free trunk hunting movement of any of the said selectors.

17. In an automatic telephone system,'an impulse sending device, several stages of selectors, the said selectors comprising marking switches associated with continuous trunk hunting movement selecting switches without normal position, a register controller for registering impulses and controlling the setting of the marking switches, two wire trunks between the register controller and the selectors, means for 1 setting. the marking switches, under the control of the register controller over only one wire of the trunk, means in each selector for opening the said wire after the set ting\of the associated marking switches until the end of the trunk hunting movement.

18. In, an automatic telephone system as claimed in claim 17, selectors comprising two interrupters disposed in the setting wire, means for opening one of them when the marking switch is in off-normal position, means for closin the other interrupter during the setting 0- the marking switch.

In witness whereof, I have hereunto set my hand this 17th day of July, 1925. p

' ANTOINE BARNAY. 

